Enhanced electrosorption of NaCl and nickel(II) in capacitive deionization by CO2 activation coconut-shell activated carbon

Huynh, Le Thanh Nguyen; Tran, Tri; Ho, Thi Thanh Nguyen; Le, Xuan Hoa; Le, Viet Hai; Nguyen, Thai Hoang

doi:10.1007/s42823-022-00387-x

Cited by 9 publications

(6 citation statements)

References 48 publications

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“…Next, the potential from 1 to 1.6 V was applied to the CDI cell, and the decreasing specific conductivity was noted until it remained unchanged. [ 29,30 ] The salt adsorption capacity (SAC, mg g –1 ) and average salt adsorption rate (ASAR, mg g –1 min –1 ) can be determined by the following Equations (3) and (4), respectively:

\begin{equation}{\mathrm{SAC\;}} = \;\frac{{{C_{\mathrm{o}}} - C}}{m}\; \times m,\end{equation}

\begin{equation}{\mathrm{ASAR\;}} = \;\frac{{{\mathrm{SAC}}}}{t},\end{equation}

where C o and C are the initial and final concentrations of NaCl solution (mg L –1 ), m is the mass active of electrode material (g), V is the volume of NaCl (L), and t is the time of desalination process (min).…”

Section: Methodsmentioning

confidence: 99%

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Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Nguyen,

Nguyen

et al. 2023

CLEAN Soil Air Water

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Many studies have shown that capacitance deionization (CDI) has great potential in salt‐water treatment, one of the issues of great concern in many countries, especially Vietnam. The electrode material in CDI is one of the essential factors contributing to the desalination efficiency of this technology, so it is of research interest. In this study, TiO2 and TiO2/carbon nanotubes (CNTs) were synthesized from the sol‐gel process and utilized as an electrode for desalination. The composite materials were intensively characterized by X‐ray diffraction, Raman spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Brunauer–Emmett–Teller and thermal analysis. The electrochemical properties were investigated using electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge. The fabricated TiO2/CNTs nanocomposite electrode consisting of 1% CNTs (electrode T1) exhibited remarkable capacitance, conductivity, and durability; thus, it was employed as an electrode for desalination. With this electrode T1, the maximum salt adsorption capacity of 17.5 mg g−1, together with the highest charge efficiency of 90%, was achieved. Therefore, TiO2/CNTs can be considered a suitable electrode candidate for CDI technology.

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\begin{equation}{\mathrm{SAC\;}} = \;\frac{{{C_{\mathrm{o}}} - C}}{m}\; \times m,\end{equation}

\begin{equation}{\mathrm{ASAR\;}} = \;\frac{{{\mathrm{SAC}}}}{t},\end{equation}

Section: Methodsmentioning

confidence: 99%

“…Next, the potential from 1 to 1.6 V was applied to the CDI cell, and the decreasing specific conductivity was noted until it remained unchanged. [29,30] The salt adsorption capacity (SAC, mg g -1 ) and average salt adsorption rate (ASAR, mg g -1 min -1 ) can be determined by the following Equations ( 3) and ( 4), respectively:…”

Section: Electrosorption Of Naclmentioning

confidence: 99%

Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Nguyen,

Nguyen

et al. 2023

CLEAN Soil Air Water

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“…nanoparticles (NPs)-loaded semiconductors − have been widely used as photocatalysts for CO 2 reduction. To promote an efficient CO 2 conversion, most of the reported works are dedicated to the adsorption and activation of CO 2 , by various strategies such as doping , or vacancy − engineering. However, the processes of H 2 O activation and dissociation have always been neglected.…”

Section: Introductionmentioning

confidence: 99%

Promoting Photocatalytic CO₂ Methanation by the Construction of Cooperative Copper Dual-Active Sites

Zhang,

Mao,

Bao

et al. 2024

ACS Catal.

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Selective photocatalytic CO 2 methanation provides an attractive avenue to address energy and environmental issues. However, impediments such as the sluggish adsorption and activation of CO 2 and H 2 O molecules, along with unexpected intermediate desorption, greatly restrict the activity and selectivity of photocatalytic CO 2 methanation. To address these issues, we devised a dual-active site catalyst comprising Cu single atoms (SAs) and nanoclusters (NCs) supported on defective TiO 2 (Cu 1+NCs /BT). As a result, a remarkable CH 4 selectivity of 98% with a yield of 19.63 μmol g cat. −1 h −1 can be obtained over the as-prepared Cu 1+NCs /BT in pure water. Mechanistic studies reveal the enhanced performance could be ascribed to the synergistic effect of the Cu dual-active sites, where Cu SAs adsorb and activate CO 2 , while Cu NCs boost H 2 O adsorption and dissociation for *H coverage. Additionally, the adjacent Cu dual-active site could jointly stabilize the *CO intermediate and reduce the energy barrier for *CO protonation, promoting the multielectron transfer process.

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“…While activated carbons are characterized by a high internal surface area and porosity, so it is suitable for CDI electrode. The research on brackish water desalination using CDI which utilizes activated carbon electrodes has been extensively conducted (Samejo et al, 2023;Kyaw et al, 2021;Huynh et al, 2022). Thus, this research focuses on the fabrication of CDI using activated carbon to obtain information regarding the most optimal materials and parameters.…”

Section: Introductionmentioning

confidence: 99%

The Utilization of Candlenut Shell-Based Activated Charcoal as the Electrode of Capacitive Deionization (CDI) for Seawater Desalination

Anas,

Napirah,

Ilmawati

et al. 2024

Sci. Technol. Indones

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Activated carbon or activated charcoal is one of the best materials that can be used as a constituent of CDI electrodes, not only because of its various advantageous properties but also because it can be sourced abundantly from plant waste. This research aims to determine the effect of the thickness of the candlenut shell activated charcoal electrode and the particle size of the activated carbon used on the capacitive deionization (CDI) performance in seawater desalination. Candlenut shell-based activated charcoal is obtained in three stages, namely preparation, carbonization, and activation. The carbonization stage was done by using a pyrolysis reactor at a temperature of 400°C for 8 hours. The activation was done with the activator of H3PO4 67%. The variation of thickness was 6 mm, 8 mm, 10 mm, and 15 mm while the variation of particle size was 60 mesh, 80 mesh, 100 mesh, and 200 mesh. The results showed that the higher capacitance was obtained with the thinner electrodes, where the best value was the thinnest electrode, 6 mm, which produced the highest capacitance, 122.96 nF. For the desalination of seawater, it is shown that the finest particle/smallest particle size will result in the best desalination performance, where 200 mesh particle size will result in the decrease of salinity from 34% to 4%. That is 88.23% decrease in salinity. Therefore, the using of candlenut shell-based activated carbon as the electrode in CDI is proven to be able to obtain good performance in seawater desalination.

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Enhanced electrosorption of NaCl and nickel(II) in capacitive deionization by CO2 activation coconut-shell activated carbon

Cited by 9 publications

References 48 publications

Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Promoting Photocatalytic CO₂ Methanation by the Construction of Cooperative Copper Dual-Active Sites

The Utilization of Candlenut Shell-Based Activated Charcoal as the Electrode of Capacitive Deionization (CDI) for Seawater Desalination

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Enhanced electrosorption of NaCl and nickel(II) in capacitive deionization by CO2 activation coconut-shell activated carbon

Cited by 9 publications

References 48 publications

Fabrication of TiO2/CNTs composite electrode with improved performance in capacitive deionization

Fabrication of TiO2/CNTs composite electrode with improved performance in capacitive deionization

Promoting Photocatalytic CO2 Methanation by the Construction of Cooperative Copper Dual-Active Sites

The Utilization of Candlenut Shell-Based Activated Charcoal as the Electrode of Capacitive Deionization (CDI) for Seawater Desalination

Contact Info

Product

Resources

About

Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Fabrication of TiO₂/CNTs composite electrode with improved performance in capacitive deionization

Promoting Photocatalytic CO₂ Methanation by the Construction of Cooperative Copper Dual-Active Sites